United States Patent 19 11 Patent Number: 5,749,923 Olip Et Al
USOO5749923A United States Patent 19 11 Patent Number: 5,749,923 Olip et al. 45) Date of Patent: May 12, 1998 54 METHOD FOR BLEACHING DENIM OTHER PUBLICATIONS TEXT LE MATERIAL Federal Law Gazette, No. 612, Sep. 24, 1992, "Limitation of Waste Water Emissions from Textile Finishing and Process 75 Inventors: Winzenz Olip. Schächtestrasse, ing Plants". Austria; Norbert Steiner. Upper Saddle Peter, M., et al. Grundlagen der Textilveredelung Basics of River, N.J. Textile Finishing, 13th ed., Deutscher Fachverlag, 1989, pp. 73 Assignee: Degussa Aktiengelschaft, Frankfurt am 80 to 81. (Month Unknown). Main, Germany Derwent Acc. No. 80-24863C, 1980 (month unknown). Derwent Acc. No. 86-268586, 1986 (Month Unknown). Derwent Acc. No. 89-155166, 1989 (Month Unknown). 21 Appl. No.: 651,785 Das, T.K., et al., “Thiourea Dioxide: A Powerful And Safe 22 Filed: May 24, 1996 Reducing Agent For Textile Applications”. Colourage, vol. 31, No. 26, 1984, pp. 15-20. (Month Unknown). Related U.S. Application Data Weiss, M., "Thiourea Dioxide: A Safe AlternativeTo Hydro sulfite Reduction”. Part 1. American Dyestuff Reporter; vol. 63 Continuation of Ser. No. 347,146, Nov. 22, 1994, Pat. No. 67. No. 8, Aug. 1978, pp. 35-38. 5,549,715. Weiss, M., "Thiourea Dioxide: A Safe Alternative to Hydro 30 Foreign Application Priority Data sulfite Reduction, Part II", American Dyestuff Reporter, vol. 67, No. 9, Sep. 1978, pp. 72-74. Nov. 23, 1993 AT Austria .............................. AT 2378/93 Primary Examiner-Alan Diamond (51 int. Cl. ... D06L 3/10 Attorney, Agent, or Firm-Spencer & Frank 52 U.S. Cl. ........................... 8/102; 8/107; 8/110; 8/111; 510/302; 510/303; 5101494; 510/367; 510/370; 57 ABSTRACT 510/470 Amethod for chlorine-free bleaching of denim textile mate 58 Field of Search ...............................
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